Okay, I know what you guys will tell me now. That there are tons of tutorials on the internet on various sites on how to install Ubuntu on an external HDD. The knowledge level will vary between using UNetBoot to burning a CD and booting from it. As with all my articles, I will write my experiences here so that I can refer to the same in future if needed and also spread the information on various aspects of upgrades of Ubuntu on external HDD. And by external HDD, I mean the external HDD with rotating platters. Not a huge USB stick or any other MMC but an external HDD.